engineering recuitment UKPSC Polytechnic Lecturer Mock Test 2024 DBMS Introduction and ER Model ER Model
Cardinality in an Entity-Relationship diagram
1
refers to the number of higher level entities that are used in the ER model
2
is used to show the ratio of one entity in relationship to another entity
3
is used to show the order of the relationships between two entities
4
gives the count of the number of entities involved in a single relationship